Special Features

Top 49 Influential Men: David Karp 28

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October 31, 2013

David Karp founded one of the most popular social-media platforms, Tumblr. It was bought by Yahoo this year for $1.1 billion. Karp's net worth is estimated to be about $200 million. Oh, and he's only 27 and is a high school dropout. Tumblr hasn't really figured out a way to earn money yet, but Yahoo's billion-dollar bet on it proves just how much tech executives believe in Karp's microblogging service. Some naysayers say that the acquisition was a poor move, but with all that Karp has accomplished before 30, we think he's still got many more tricks up his sleeve.